On Rule number 4, does it have to be a stock choke? Or can it be a modified one? Just a functioning choke?
Rule 7? Is there a limit to how many pipes? and is that ID or OD.
Any specifications on the spark screen? How will you test this?
spark screen should be visible through the exhaust port or over it however you want to install it as long as it would be functional and forest service approved. it must have the factory true carb with the choke intact and functioning as a everyday work saw would.modify it however you want as long as it functions correctly.